| 基于认知的LTE系统动态频谱分配 |
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| 引用本文： | 刘勤,李红霞,李钊,孔欣怡.基于认知的LTE系统动态频谱分配[J].电子与信息学报,2015,37(1):175-181. |
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| 作者姓名： | 刘勤 李红霞 李钊 孔欣怡 |
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| 作者单位： | 西安电子科技大学综合业务网理论及关键技术国家重点实验室 西安710071 |
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| 基金项目： | 国家自然科学基金重点项目(61231008)，重大专项(2012ZX03003005-005)，国家自然科学基金(61102057)，高等学校引智计划(B08038)，长江学者和创新团队发展计划(IRT0852)和中央高校基本科研业务费(K5051301014)资助课题 |
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| 摘 要： | 传统的软频率复用(SFR)无法适应长期演进(LTE)系统中业务的动态分布，可能导致小区中心和边缘区域频谱利用率不均。针对此问题，该文提出一种基于认知的LTE系统动态频谱分配方法(Cog-DSA)。该方法利用基站间的相互协作获得频谱使用状态信息，从而确定可用频谱集合，并评估来自邻小区的同频干扰，最终根据可用资源块的通信质量，对重负荷小区边缘进行频谱的动态借用和服务基站的灵活选择。仿真结果表明，所提方法能够有效改善频谱利用率，减少小区间干扰，显著提升边缘用户的传输速率。
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| 关 键 词： | 无线通信 频谱分配 长期演进 软频率复用 认知技术 |
| 收稿时间： | 2014-01-03 |
Dynamic Spectrum Allocation for LTE System by Exploiting Cognitive Capability |
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| Liu Qin
,
Li Hong-xia
,
Li Zhao
,
Kong Xin-yi.Dynamic Spectrum Allocation for LTE System by Exploiting Cognitive Capability[J].Journal of Electronics & Information Technology,2015,37(1):175-181. |
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| Authors: | Liu Qin Li Hong-xia Li Zhao Kong Xin-yi |
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| Affiliation: | (State Key Laboratory of Integrated Service Networks, Xidian University, Xi’an 710071, China) |
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| Abstract: | Traditional Soft Frequency Reuse (SFR) can not adapt to dynamic traffic distribution in Long Term Evolution (LTE) systems, leading to imbalanced spectral efficiency in cell center and edge area. In order to solve this problem, this paper proposes a Dynamic Spectrum Allocation scheme for LTE system by exploiting Cognitive capability (Cog-DSA). By exploiting inter base station cooperation, spectrum use status is acquired. Then the available spectrum set is determined and co-channel interference from adjacent cells is evaluated. Finally, dynamic spectrum borrowing and service base station selection are implemented. Simulation results demonstrate that the proposed Cog-DSA method can effectively improve the spectrum utilization, mitigate inter-cell interference and significantly raise cell edge users'' transmission rate. |
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| Keywords: | Wireless communication Spectrum allocation Long Term Evolution (LTE) Soft Frequency Reuse (SFR) Cognitive technology |
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